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In spark-ignition internal combustion engines, knocking (also knock, detonation, spark knock, pinging or pinking) occurs when combustion of some of the air/fuel mixture in the cylinder does not result from propagation of the flame front ignited by the spark plug, but when one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front.
Head pin: The 1-pin. (The) Heads: The front part of the lane, roughly from the foul line to the arrows. Precedes the midlane and back end. Heavy: See high. Opposite of light. Hook: The second of three phases [61] of ball motion—following the skid phase and preceding the roll phase—characterized by maximum change in ball direction.
In most steam engine designs there is a short time at the end of the return stroke of the piston when all the valves are shut and it is compressing any remaining steam. Water can be introduced from the boiler or in a cold engine, steam will condense to water on the cool walls of the cylinders and can potentially hydrolock an engine.
Crashes at intersections (road junctions) are a very common type of road collision types. Collisions may involve head-on impact when one vehicle crosses an opposing lane of traffic to turn at an intersection, or side impacts when one vehicle crosses the path of an adjoining vehicle at an intersection.
The wrestler faces toward the opponent, and strikes the front or back of the head with a full swinging back elbow. The move can be performed on an opponent who is kneeling and facing away. This is commonly used by Will Ospreay as a finisher, which he names the Hidden Blade , which usually sees him charge towards a seated, kneeling, or rising ...
It was also the last Super Bowl, and penultimate game overall (the 1974 Pro Bowl in Kansas City played the next week was the last) to feature goal posts at the front of the end zone (they were moved to the endline, in the back of the end zone, the next season). This was the Dolphins' third consecutive Super Bowl appearance.
A rear-end collision, often called rear-ending or, in the UK, a shunt, occurs when a forward-moving vehicle crashes into the back of another vehicle (often stationary) in front of it. Similarly, rear-end rail collisions occur when a train runs into the end of a preceding train on the same track . [ 1 ]
A head shake is a gesture in which the head is turned left and right along the transverse plane repeatedly in quick succession. In many cultures, it is most commonly, [1] but not universally, used to indicate disagreement, denial, or rejection. It can also signify disapproval or upset at a situation, often with slower movement.